Update README.md

README.md

@@ -30,7 +30,7 @@ git clone http://gitlab.lcqb.upmc.fr/vicedomini/metaclade2.git
 ```
 Then, it is advised to include MetaCLADE2 directory in your PATH environment variable by adding the following line to your `~/.bashrc` file:
 ```
-export PATH=[MetaCLADE2_DIR]:${PATH}"
+export PATH=[MetaCLADE2_DIR]:${PATH}
 ```
 where `[MetaCLADE2_DIR]` is MetaCLADE2 installation directory.